Chapter 32
Alternating-Current Circuits
交流电源
Direct current is a flow of electric charge in only one direction and has a steady state of constant voltage in the circuit. Rectifiers, batteries, ...
交流电路中的 RMS 值
The root mean square (RMS) value is a measure of the effective or average value of an alternating current (AC) waveform. In AC circuits, the voltage or ...
交流电路中的电阻器
An alternating emf or voltage source is needed to supply an alternating current (AC) to a circuit. A coil of wire rotating in a magnetic field at a ...
交流电路中的电容器
A capacitor is charged by passing an electric current through it, which causes the plates to start accumulating an electrostatic charge. Since the ...
交流电路中的电感器
The basic components of an inductor are coils or loops of wire that are either wound around a hollow tube former or a ferromagnetic material (iron-cored) ...
RLC 系列电路:简介
Consider an RLC series circuit consisting of a resistor, an inductor, and a capacitor connected to an AC voltage source. A current, which varies ...
RLC 系列电路:阻抗
When current flow is opposed in a DC or AC circuit, it is referred to as resistance or impedance, respectively. Impedance plays a key role in determining ...
RLC 系列电路:解决问题
Consider an AC generator with a frequency of 50 hertz and a voltage of 120 volts. The AC generator is connected to an RLC series circuit with a 20-ohms ...
交流电路中的电源
In a DC circuit, the power consumed is simply the product of the DC voltage times the DC current, given in watts. However, the power consumed for AC ...
交流电路中的谐振
The property of an inductor makes it resist any change in the current passing through it, while the property of a capacitor is to build up the charge ...
变形金刚
A device that transforms voltages from one value to another using induction is called a transformer. A transformer consists of two separate coils, or ...
变压器的类型
Transformers can provide desired voltages to a circuit by modifying the number of turns in the secondary windings.
If the ratio of the number of turns in ...
变压器中的能量损失
In an ideal transformer, it is assumed that there are no energy losses, and, hence, all the power at the primary winding is transferred to the secondary ...
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